Carpenter&#39;s square



Dec. 25, H, BAUMUNK CARPENTERS SQUARE Filed Oct. 19, 1955 Fig./

aw B1 E M m, fm M @w Q m. MN P United States Patent O 2,775,037 CARPENTERS SQUARE Harry Baumunk, Big Rapids, Mich. Application October 19, 1953, Serial No. 386,731 2 Claims. (Cl. 33-120) 'I'his invention relates to a carpenters square and more specifically provides a square having an adjustable angle wherein a carpenter may easily and expeditiously cut rafters with various angles Without any exceptional skill.

An object of this invention is to provide a carpenters square for cutting rafters for any given run and pitch.

Another object of this invention is to provide a carpenters square wherein the heel cut and the top cut may be made at any pitch from 1/6 to 3A A further object of this invention is to provide a carpenters square having index lines thereon for adjusting the angular relation between the two legs of the carpenters square for setting the angle cut on the rafters for various pitch rafters.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a top plan View of the carpenters square of this invention;

Figure 2 is a longitudinal, vertical section taken substantially along section line 22 of Figure 1, showing details of the angular adjustment lock means; and

Figure 3 is a bottom plan view of the structure of Figure 1, showing the top cut indicating lines.

Referring now to the drawings specifically, it will be seen that the numeral generally designates the carpenters square of this invention including a pair of blades 12 and 14 with the blade 12 being longer and wider than the blade 14. The blades 12 and 14 are pivotally connected together at adjacent end portions by a pivot pin 16 rigidly secured to the blade 14 and projecting up through a suitable aperture in the blade 12 and the pin 16 includes a projecting head portion 18 for purposes described hereinafter. A sleeve 20 surrounds a shank of the pin 16 and the head portion 18 and is slidable thereon and projects above the head 18 and the sleeve 20 is closed by a handle member 22 which projects on each side of the sleeve 20. The sleeve 20 is screw threaded into a recess 24 in a projecting arm 26 having a depending pin 28 thereon for engaging selective apertures 30 in the blades 12 and 14. As will be seen in the drawings, the apertures 30 are spaced about the pivot pin 16 with a radius equal to the distance from the center of the pivot pin 16 to the center of the depending pin 28. As will be seen in Figures l and 3, the upper surface of the blade 14 is provided with index lines 32 and the undersurface of the blade 12 is provided with index lines 34, which extend across the blades 12 and 14 in angular relation. Suitable indicia markings 36 are provided adjacent the index lines and corresponding indicia 38 is placed adjacent the apertures 30. It will be understood that when the blades 12 and 14 are moved to be aligned with index lines 32, the pin 28 is moved into the aperture 30 having a corresponding indicia 38 to the indicia 36 and apertures in the blades 12 and 14 will be aligned so that the pin 28 engages the apertures and locks the blades 12 and 14 in angular relation. It will be understood that the blades 12 and 14 have the usual indicia 40 thereon indicating lineal measurement and the blades 2,775,037 Patented Dec. 25, 1956 may further be provided with indicia showing the rafter scale of common rafters, hip and valley and jack rafters, and further showing brace rule and angle cuts for polygons used in building structures. This indicia is not shown and is conventional in well known scales in the carpentering industry.

The operation of the device will be readily understood when a heel cut is desired to be made, the handle portion 22 is raised against the action of the coil spring 42 disposed between the head 18 and the bottom of the recess 24 for urging the arm 26 against the blade 12 and the blades 12 and 14 are moved in relation to each other until the edge of the blade 12 overlies the index line with the correct pitch, and the pin 28 is inserted in the aperture 30 with the corresponding indicia on the heel cut group of apertures. The device is reversed for the top cut then after the blades have been aligned with the pitch index line the pin 28 is inserted in apertures corresponding to the index line in the top cut.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly al1 suitable modifications and equivalents may be resorted to, falling within the scope of the appended claims.

What is claimed as new is as follows:

l. A carpenters square comprising a pair of blades, a pivot pin connecting said blades together, a plurality of apertures spaced about said pin, a plurality of index lines on each of said blades for indicating the angular relation of the blades, and disengageable means engaging selective apertures when said blades are aligned with selective index lines, said apertures and index lines being provided with corresponding indicia for denoting an angular relationship, said pivot pin including a projecting shank, a sleeve slidable on said shank, a projecting arm on said sleeve, said disengageable means including a depending pin on said arm receivable in selective apertures, and spring means urging said sleeve, arm and pin downwardly.

2. A carpenters square comprising a pair of elongated blades, a pivot pin connecting adjacent ends of the blades together in overlapping relation, said pin having a projecting shank with a headed end, a sleeve slidably positioned around said shank, a projecting arm secured to the bottom of the sleeve and forming a closure therefor, a spring disposed around said shank between the headed end and the upper surface of the arm for urging the arm towards the surface of one of said blades, a projecting handle on said sleeve for raising said arm against the resistance of said spring, a plurality of circumferentially spaced apertures in each of said blades, said apertures being disposed about said pin and being selectively aligned at various angular positions of the blades, a depending pin on the outer end of said arm for selective insertion into aligned apertures in the blades for locking the blades in adjusted angular relation, index lines on the facing surfaces of the blades, said apertures and index lines being provided with numerical indicia for indicating the heel and top cut of a rafter.

References Cited in the ile of this patent UNITED STATES PATENTS 342,849 Seltzer June l, 1886 579,023 Stoy Mar. 16, 1897 986,239 Stoddard Mar. 7, 1911 1,483,935 Golden Feb. 19, 1924 1,916,638 Rzianu July 4, 1933 

